Integrating digital watermarks in multimedia content

- Digimarc Corporation

A method for decoding auxiliary data from media signals in multimedia content decodes watermarks from different media signals and uses the watermarks to control processing of the multimedia content. A copy control method decodes a watermark from one of the media signals in multimedia content, and uses the watermark to control processing of the multimedia content. Another method uses a watermark decoded from a first media signal to decode a second media signal. Yet another method uses a watermark decoded from a media signal to decode metadata associated with the media signal. Finally, another method forms a key for decoding data from at least first and second watermarks extracted from first and second media signals.

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Description

RELATED APPLICATION DATA

This patent application is a continuation of application Ser. No. 09/525,865, filed Mar. 15, 2000 now U.S. Pat. No. 6,661,607, which claims priority from U.S. provisional patent application 60/180,364, filed Feb. 4, 2000. Application Ser. No. 09/525,865 is also a continuation-in-part of application Ser. No. 09/503,881, filed Feb. 14, 2000 now U.S. Pat. No. 6,614,914, and application Ser. No. 09/186,962, filed Nov. 5, 1998, which is a continuation of application Ser No. 08/649,419, filed May 16, 1996, now U.S. Pat. No. 5,862,260. Application Ser. No. 08/649,419 is a continuation-in-part of application Ser. No. 08/508,083, filed Jul. 27, 1995 (now U.S. Pat. No. 5,841,978) and application Ser. No. 08/436,098 (now U.S. Pat. No. 5,636,292), filed May 8, 1995, which is a continuation in part of application Ser. No. 08/327,426, filed Oct. 21, 1994 (now U.S. Pat. No. 5,768,426), application Ser. No. 08/215,289, filed Mar. 17, 1994 (now abandoned), and application Ser. No. 08/154,866, filed Nov. 18, 1993 (now abandoned).

TECHNICAL FIELD

The invention relates to digital watermarking, and more specifically relates to applications of digital watermarks in multimedia data.

BACKGROUND AND SUMMARY

Digital watermarking is a process for modifying media content to embed a machine-readable code into the data content. The data may be modified such that the embedded code is imperceptible or nearly imperceptible to the user, yet may be detected through an automated detection process. Most commonly, digital watermarking is applied to media such as images, audio signals, and video signals. However, it may also be applied to other types of data, including documents (e.g., through line, word or character shifting), software, multi-dimensional graphics models, and surface textures of objects.

Digital watermarking systems have two primary components: an embedding component that embeds the watermark in the media content, and a reading component that detects and reads the embedded watermark. The embedding component embeds a watermark pattern by altering data samples of the media content in the spatial or frequency domains. The reading component analyzes target content to detect whether a watermark pattern is present. In applications where the watermark encodes information, the reader extracts this information from the detected watermark.

Recently, digital watermarks have been used in applications for encoding auxiliary data in video, audio and still images. Despite the pervasiveness of multimedia content, such applications generally focus on ways to embed and detect watermarks in a single media type.

One aspect of the invention is a method for decoding auxiliary data in multimedia content with two or more media signals of different media types. This method decodes watermarks in the media signals, uses the watermarks from the different media signals to control processing of the multimedia content. There are many applications of this method. One application is to use the watermark in one media signal to locate the watermark in another media signal. This is applicable to movies where a watermark in one media signal, such as the audio or video track, is used to locate the watermark in another media signal.

The watermark messages from different media signals may be combined for a variety of applications. One such application is to control processing of the multimedia signal. For example, the combined message can be used to control playback, copying or recording of the multimedia content.

Another aspect of the invention is a method for copy control of multimedia content where a watermark from one media signal is used to control processing of the multimedia content. An audio watermark may be used to control processing of the video signal in a movie, or a video watermark may be used to control processing of the audio signal in the movie.

Another aspect of the invention is a method for watermark decoding where a watermark decoded from a first media signal of a first media type is used to decoding a second media signal. The first and second media signals may be of the same or different types. Also, they may be part of the same composite media signal, such as an audio or video sequence. The term, “composite,” refers to a collection of media signals, which may be temporal portions (e.g., time frames in audio or video), or spatial portions (e.g., blocks of pixels in an image or video frame) of a visual, audio, or audio visual work. As an example, the first media signal may be an audio or video frame (or frames) in an audio or video sequence and the second media signal may be subsequent frames in the same sequence.

This method may be used in a variety of applications. The watermark in the first media signal may be used to de-scramble, decrypt, or decompress the second media signal. In addition, the watermark in the first media signal may be used to decode a different watermark from the second signal.

Another aspect of the invention is a method that uses a watermark decoded from a first media signal of a first media type to decode metadata associated with the first media signal. The watermark may be used to locate the metadata, which may be hidden for security purposes. The metadata located from the watermark may be located on the same storage medium that includes the first media signal. For example, the metadata may be located on portable storage device, such as flash memory, a magnetic memory device (e.g., tape or disk), or an optical memory device (e.g., CD, DVD, minidisk, etc.). The metadata may be located in a file header or some other place (e.g., encoded in the disk wobble).

There are a variety of applications of the watermark in this context. It may carry a key to decrypt, decompress, descramble, or locate the metadata. The metadata, in turn, may be used to control processing of the media signal in a computer or consumer electronic device. For example, it may be used to control usage rights, playback, recording, copying, transfer, etc.

Yet another aspect of the invention is a method that decodes first and second watermarks and forms a key for decoding data from the first and second watermarks. The watermarks may be decoded from the same or different media signals. For example, the watermarks may be decoded from media signals from the same composite signal. They may be derived from different types of media signals, such as the audio and video tracks of a movie. Alternatively, they may be derived from different parts of the same type of media signal, such as an audio sequence, video sequence, or image. The watermarks may be extracted from a signal or signals stored in a storage device, such as a portable storage device (e.g., optical or magnetic disk or tape, flash memory, etc.).

The key formed from the watermarks may be used for a variety of applications. It may be used as a watermark key to decode a watermark from a media signal. It may be used as a decryption or de-scrambling key. Also, it may be used as a decompression key (e.g., a parameter used to decompress a media signal).

Further features of the invention will become apparent with reference to the following detailed description and accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram of a watermark encoder system for encoding watermarks in multimedia content.

FIG. 2 is a diagram of a watermark decoder system for multimedia data.

FIG. 3 is a diagram of a watermark decoder system where watermark detectors for different media types collaborate.

FIG. 4 is a diagram of a watermark decoder system where watermark readers for different media types collaborate.

FIG. 5 illustrates an operating environment for implementations of the invention.

DETAILED DESCRIPTION

1.0 Introduction

The following sections describe applications for integrating watermarks in multimedia data. In general, these applications exploit some level of interaction between watermarks and/or metadata associated with two or more different media types. The types of media supported in a given implementation vary with the application, and may include, for example, audio (e.g., speech, music, etc.), video, images, graphical models, etc.

The initial sections describe ways to integrate watermark embedder and detector systems in multimedia data. These techniques may be applied to many different applications, including, for example, copy protection, content authentication, binding media content with external data or machine instructions, etc.

Later sections discuss specific application scenarios.

2.0 Integration of Watermarks and Metadata of Different Data Types

2.1 Defining Multimedia

The term, multimedia, as used in this document, refers to any data that has a collection of two or more different media types. One example is a movie, which has an audio and video track. Other examples include multimedia collections that are packaged together on a storage device, such as optical or magnetic storage device. For example, media signals such as still images, music, graphical models and videos may be packaged on a portable storage device such as CD, DVD, tape, or flash memory card. Different media signals may be played back concurrently, such as the video and audio tracks of a movie, or may be played independently.

2.2 Levels of Integration of Watermark Systems

The extent of integration of watermark systems for different media types ranges from a low level of integration, where watermark decoders operate independently on different media types, to a high level of integration, where the decoders functionally interact. At a low level of integration, the watermark systems for different media types operate on their respective media types independently, yet there is some relationship between the auxiliary data embedded in each type. At a high level of integration, components of the watermark detectors and readers share information and assist each other to perform their respective functions.

FIG. 1 illustrates an encoder system for embedding messages into a multimedia content with two or more media types. One example of multimedia content is a movie with video and audio tracks. For the purpose of illustrating the system, the following sections use a movie as an example of multimedia content. Similar methods may be implemented for other forms of multimedia content, such as combinations of three-dimensional/two-dimensional graphics and animation, audio, video, and still images.

In the encoder system shown in FIG. 1, there is a watermark encoder 20, 22 for each media type. Each encoder may embed a message 24, 26 into the corresponding media type 28, 30 in the native domain of the signal (e.g., a spatial or temporal domain) or in some transform domain (e.g., frequency coefficients). The result is multimedia content 32 having watermarks in different media types. The multimedia content 32 may be packaged and distributed on a portable storage device, such as a CD, DVD, flash memory, or delivered electronically from one machine or device to another in a file or streaming format.

There are a variety of ways to integrate the encoder functions. One way is to use a unified key that controls how a given message or set of messages are encoded and located within the respective media types. Another way is to insert a common message component in two or more different media types. Yet another way is to make a message inserted in one media type dependent on the content of one or more other media types. For example, attributes of an image may be extracted from the image and encoded into an audio track, and similarly, attributes of an audio track may be extracted and encoded in an image. Finally, the message in one media type may be used to control the processing of another media type. For example, copy control flags in a movie's audio track may be used to control copying of the movie's video track or the movie; and, copy control flags in the video track may be used to control copying of the audio track or the movie.

The following sub-sections describe various scenarios for integrating watermarks in different media types from the perspective of the decoder.

2.2.1 Auxiliary Data Embedded in Different Media Types

FIG. 2 depicts a framework for low level integration, where watermark decoders 40, 42 for different media types 44, 46 operate independently, yet an application 58 uses the auxiliary data associated with each of the media types. The auxiliary data may be encoded in a watermark message within a media signal or may be located in metadata accompanying the media signal (e.g., on the storage device and/or within a header of a file or data packet encapsulating the media). The multimedia content 50 is annotated with a “*” to reflect that it may not be identical to the original version of the content (e.g., the content shown at item 32, FIG. 1) at the time of encoding due to intentional or unintentional corruption (e.g., filtering, compression, geometric or temporal transforms, analog to digital, and digital to analog conversion). A content reader 52 receives the multimedia data and identifies the distinct media types within it. The functionality of the content reader may be built into a watermark decoder or provided by a separate computer program or device. In the example of a movie, the content reader identifies the audio and video tracks.

Watermark decoders for each media type operate on their respective media data. In extracting the watermark from the signal domain in which the embedder inserted it, the decoder functions compliment the embedder functions. In many applications, the media types may be coded in a standard or proprietary format. In the example of a movie, both the audio and video tracks are typically compressed (e.g., using some lossy transform domain compression codec like MPEG). The watermark decoders may operate on compressed, partially compressed or uncompressed data. For example, the decoders may operate on frequency coefficients in the compressed image, video or audio data. As shown in FIG. 2, the decoders 40, 42 operate independently on corresponding media types to extract messages 54, 56 from watermarks in each media type.

In the low level integration scenario of FIG. 2, an application 58 uses the messages from different media types to process the multimedia content. The application is a device, software process, or combination of a device and software. The specific nature of this processing depends on the requirements of a particular application. In some cases, the message embedded in one media type references content of another type (e.g., link 60 from message 54 to media type 2). For example, text sub-titles in a movie may be embedded in the audio track, and may be linked to specific frames of video in the video track via frame identifiers, such as frame numbers or addresses. The application, in this scenario, controls the playback by superimposing the text sub-titles on the linked frames.

In many applications, it may be useful to insert a link in one media type to content of another media type within the multimedia data. For example, one might want to link a still image or a video texture to a graphical model. Then, a graphics rendering application may use the link to determine which image (or video) to map to the surface of a graphical model. As another example, one might link an audio clip to an image, graphical model or other media object. When instructed to render the image, model or other media object, the rendering application then uses the link to also initiate playback of the linked audio clip, and optionally, to synchronize playback of the linking media signal with the signal linked by the watermark. For example, the video watermark could specify which audio clip to play and when to initiate playback of parts of the audio clip. Stated more generally, the embedded link from one media type to another may be used by the rendering application to control the relationship between the linked media objects during playback and to control the playback process.

The media signals within multimedia content can be linked together through watermarks and embedded with control information and metadata that is used to control playback. The entire script for controlling playback of a multimedia file or collection may be embedded in watermarks in the media signals. For example, a user could initiate playback by clicking on an image from the multimedia content. In response, the rendering application extracts control instructions, links, and/or metadata to determine how to playback video, audio, animation and other media signals in the multimedia content. The rendering application can execute a script embedded in a watermark or linked via a reference in the watermark (e.g., a watermark message includes a pointer to, or an index or address of a script program stored elsewhere). The watermark message may also specify the order of playback, either by including a script, or linking to a script that contains this ordering. Several media signals may be tied together in a playback sequence via a linked list structure where watermarks embedded in the media signals reference the next media signal to be played back (as well as media signals to be played back concurrently). Each media signal may link to another one by providing a media signal identifier in the watermark message, such as an address, pointer, index, name of media title, etc.

As the rendering application plays back multimedia content, it can also display metadata about the media signals (e.g., the content owner, a description of the content, time and location of creation, etc.). The watermark messages embedded in the media signals can either include this metadata or link to it. In addition, the watermark messages may include instructions (or a link to instructions) for indicating how and when to display metadata. The metadata need not be in text form. For example, metadata may be in the form of speech output (via a text to speech synthesis system), a pre-recorded audio clip, video clip, or animation.

To embed a variety of different information, instructions and links into the media signals within multimedia content, the embedder can locate watermark messages in different temporal portions (e.g., time multiplex different messages) of a time varying signal like audio or video. Similarly, the embedder can locate different watermark messages in different spatial portions of images, graphical models, or video frames. Finally, the embedder can locate different watermark messages in different transform domains (e.g., Discrete Fourier Transform, Discrete Cosine Transform, Wavelet transform, etc.) of image or audio signals.

The following sub-sections describe additional application scenarios.

2.2.1.1 Copy Protection

In a copy protection application, the messages embedded in each media type convey information to the application specifying how it may use the content. For example, each message may provide copy control flags specifying “copy once”, “copy no more”, “copy freely”, and “copy never.” These flags indicate whether the application may copy the media type or the multimedia content as a whole, and if so, how many times it may copy the pertinent content.

The application collects the copy control flags from the different media types and determines the extent to which it may copy the content or selected media types within it.

2.2.1.2 Ownership Management

In multimedia content, each media type may be owned by different entities. The messages embedded in the content may contain an owner identifier or link to an owner. An ownership management application can then collect the ownership information, either from each of the messages in each media type, or by requesting this information by following the link to the owner. For example, the link may be associated with an external database that provides this information. The application may use the link to query a local database for the information. Alternatively, the application may use the link to query a remote database via a wire, wireless, or combination of wire and wireless connections to a remote database on a communication network (e.g., the Internet). One or more intermediate processing stages may be invoked to convert the link into a query to the remote database. For example, the link may be a unique number, index or address that cross-references the URL of a database server on the Internet.

2.2.1.3 Media Authentication

An authentication application may use watermark messages and/or metadata to authenticate media signals within the multimedia content. One or more of the media signals in multimedia content may be tampered with. Multimedia content poses an additional problem because media signals may be swapped into the content in place of the original signals. For example, in a video used as evidence, one might swap in a fake audio clip or remove a portion of the audio track. One way to authenticate the media signals is to extract features from them, hash the features, and insert the hashed features into the watermark messages of one or more of the media signals at encoding time.

To verify authenticity, the application at the decoder side repeats the process of extracting the features from the received media types (e.g., 44, 46), hashing these features, and then comparing the new hash with the hash extracted from the watermark message or messages. The objective of the hash is to create a content dependent parameter that may be inserted into a watermark message, or in some cases, in metadata associated with a media signal. The hash is not necessary if the size of the extracted features is such that they fit within a message.

Examples of features in images include the location of identifiable objects (such as the location of eyes and noses of human subjects), the shape of objects (e.g., a binary mask or chain code of an object in an image), the inertia of an image, a low pass filtering of an image, the Most Significant Bit of every pixel in a selected color plane (luminance, chrominance, Red, Green, Blue, etc.).

Examples of features in audio include the temporal location of certain aural attributes (e.g., a transition from quiet to high intensity, sharp transitions in spectral energy, etc.), a low pass filter of an audio clip, etc.

Features from one media type may be inserted into a watermark or the metadata of another media type. Alternatively, they may be combined and inserted in one or more of the media types in a watermark embedded in a watermark of the media signal or its metadata.

An additional level of security may be added using public key encryption techniques to create a digital signature that identifies the source of the multimedia content. Some examples of public key cryptography include RSA, DES, IDEA (International Data Encryption Algorithm), skipjack, discrete log systems (e.g., El Gamal Cipher), elliptic curve systems, cellular automata, etc. Public key cryptography systems employ a private and public key. The private key is kept secret, and the public key is distributed to users. To digitally sign a message, the originator of the message encrypts the message with his private key. The private key is uniquely associated with the originator. Those users having a public key verify that the message has originated from the holder of the private key by using the public key to decrypt the message.

2.2.2 Integrating Watermark Detection Processes

Another way to integrate processing of media types is to integrate watermark detectors for different media types. One function of some watermark detectors is to determine the orientation and strength of a watermark within a host media signal. The orientation may provide the watermark location, and possibly other orientation parameters like warp (e.g., an affine or non-linear warp, temporal and/or spatial), scale, rotation, shear, etc. As the media content is subjected to various transformations, the watermark orientation and strength may change. Watermark detectors use attributes of the watermark signal to identify its location and orientation within a host signal. In multimedia content where different media signals are watermarked, detectors for the respective media signals can assist each other by sharing information about the orientation and/or strength of a watermark in the media signals. While the watermarks in different media types may be transformed in different ways, the orientation information found in one media signal might help locate a watermark in a different media signal.

FIG. 3 depicts a watermark decoder framework in which the watermark detectors for different media types collaborate. Each detector 70, 72 operates on its respective media type 74, 76, yet the detectors share information. The detectors determine the presence, and in some cases, the strength and/or orientation of a watermark in a host media signal. In some applications, such as authentication, the detector identifies portions of the media signal that have a valid watermark signal, and portions where the watermark has been degraded (e.g., the watermark is no longer detectable, or its strength is reduced). Depending on the nature of the host signal, these portions may be temporal portions (e.g., a time segment within an audio signal where the watermark is missing or degraded) or spatial portions (e.g., groups of pixels in an image where the watermark is missing or degraded). The absence of a watermark signal, or a degraded watermark signal, may evidence that the host signal has been tampered with.

In applications where the watermark carries a message, each detector may invoke a watermark reader 78, 80 to extract a message from the watermark. In some cases, the reader uses the orientation to locate and read the watermark. The strength of the watermark signal may also be used to give signal samples more or less weight in message decoding. Preferably, each reader should be able to read a watermark message 82, 84 from a media signal without requiring the original, un-watermarked media signal.

One example of integrated detection is a scheme where watermark detectors operate on respective media types concurrently and share orientation parameters. To illustrate the scheme, consider the example of a movie that has a watermarked audio and video track. While video and audio are distinct media signals in the content delivery and storage formats, the video and audio tracks are carefully synchronized so that the audio closely tracks the movement of actors' mouths and other motion depicted in the video. The embedding scheme places audio watermarks within a specified temporal range of the video watermarks. Because the video and audio tracks need to be temporally synchronized to avoid noticeable artifacts during playback, the temporal locations of the audio and video watermarks are likely to remain within a predictable temporal distance in their respective host signals. As such, the watermark detectors can take advantage of the temporal relationship of the watermarks in different media types to facilitate detection.

The location of a watermark detected in one media signal can provide information about the location of a watermark yet to be detected in another media signal. For example, when the video watermark detector finds a watermark in a video frame (e.g., an I frame in MPEG video), it signals the other detector, passing information about the temporal location of the video watermark. Leveraging the temporal relationship between the video and audio watermarks, the audio watermark detector confines its search for an audio watermark to a specified temporal range in the audio signal relative to the location of the corresponding video watermark in the video signal.

In this scenario, the audio watermark detector may provide similar information to the video watermark detector to help it identify the frame or sequence of frames to be analyzed for a video watermark.

Another example is a scheme where one watermark detector operates on a media type, and then passes orientation parameters to a detector of another media type. This scheme reduces the complexity of the second detector because it uses the orientation parameters extracted from a first media type to assist computation of the orientation in another media type. Applying this scheme to the previous example of a movie, the watermark decoder method reduces the complexity of the audio detector by confining its search to a specified range defined relative to the location of a video watermark. This is a simpler case than the previous example in the sense that the orientation information flows solely from a first detector to a second one. The second detector searches in a confined space around the location specified by the other detector, and does not have to pass orientation information to the other detector.

2.2.3.1 Applications of Integrated Watermark Detectors

As in the previous sections, there are a variety of applications for watermark systems with integrated detectors. The watermarks may be used to encode data or links to external data or other media signals within the multimedia content.

The watermarks may also be used to encode authentication information. In the movie example, the watermarks in one media type can reference one or more watermarks in another media type. For example, if an audio detector does not find an audio watermark designated by the video watermark to be in a specified range within the audio signal, then it can mark that specified range as being corrupted. Similarly, the video detector can authenticate video frames based on presence or absence of video watermarks designated by audio watermarks.

In copy control applications for mixed media like movies, integrated detectors can be used to locate audio and video watermarks carrying copy control flags. If the audio or the video tracks have been tampered with or transformed in a way that removes or degrades the watermarks, then a copy control application can take the appropriate action in response to detecting the absence of a watermark or a degraded watermark. The actions triggered in response may include, for example, preventing copying, recording, playback, etc.

2.2.4 Integrating Watermark Message Reading of Different Media Types

FIG. 4 illustrates yet another scenario for integrating watermark decoders where the watermark readers for different media types collaborate. In this scheme, watermark detectors 100, 102 for different media types 104, 106 operate independently (or collaborate as described above) to detect the presence, and optionally the orientation, of watermarks in their respective media types. Watermark readers 108, 110 then extract messages from the detected watermarks. The watermark readers pool the message data 112 that they extract from the different media types.

Then, a message decoder 114 attempts to decode the pooled message data. The message decoder may perform various error correction decoding operations, such as Reed Solomon, BCH, Turbo, Convolution operations. In cases where the watermark embedder uses spread spectrum modulation to spread raw message bits in the host media signal into chips, the message decoder may perform the inverse of a spread spectrum modulation function to convert spread spectrum chip values back to raw message values.

The result of the decoding operations provides information about the media signals. Depending on the application and implementation, the decoded message 116 can be interpreted in different ways. For example, in some cases, to generate a valid decoded message (as indicated by an error detection process such as a CRC or parity check), watermark message data from each media signal must be valid. In other cases, the decoded message may specify which media signals have valid messages, and which do not.

2.2.4.1 Applications

Like the other scenarios described above, the scheme for integrating watermark readers of different media types can be applied to many applications, including data embedding and linking, content authentication, broadcast monitoring, copy control, etc. This scheme is particularly suited for content authentication and copy control because it can be used to indicate content tampering and to disable various operations, such as copying, playback, recording, etc. For example, it can be used in a copy control scheme for content with audio and video tracks. Each track contains watermark messages that must be detected and converted to the raw message data 112 before the decoder 114 can decode a valid message. Thus, valid copy control information in both the video and audio tracks must be present before a valid copy control message 116 will be produced. A player can then process the multimedia content based on the control information in the valid copy control message. Alternatively, the content can be prevented from being passed into a player or other application or device if a valid control message is not generated.

2.2.5 Using Watermark Messages to Store Keys to other Watermarks or Metadata

The watermark message in one media signal may be used to specify a key of a watermark in another media signal. In this scenario, the watermark reader for one media type supplies the watermark decoder for another media type with the key. This key may specify the location of the watermark as well as information about how to extract the watermark from another media signal, and information to decode or decrypt the watermark message.

The watermark message in a media signal may also specify a key to access other metadata on the storage device of the media signal. For example, the message may specify a key to decrypt or decode metadata on the storage device, such as metadata in a header file or encoded within tracks of a CD or DVD (e.g., encoded within the disk wobble). The key may also specify the location of the associated metadata.

2.2.5.1 Applications

The scheme described in the previous section may be used in many applications, including those discussed previously. This scheme is particularly suited for content authentication and copy protection. In order to authenticate the content, each of the media signals in multimedia content need to have valid watermarks. The watermark in one media signal cannot be located without extracting a key from a watermark in another media signal.

In copy protection applications, the decoding system would need to find the watermarks in each of the media signals before enabling certain actions (e.g., playback, recording, copying, etc.).

2.3 Using Watermark Data in One Media Type to Control Playback of Another Media Type

For some applications, it is not necessary that each media signal in multimedia content have a watermark. For example, a watermark in one media signal could provide the desired functionality for the entire content, or for selected portions of the content. For example, in copy protection applications for movies, a watermark in the audio track could be used to encode copy control flags to control copying, playback, or recording of audio and/or video tracks.

2.4 Using Watermark Data in Conjunction with other Data or Applications

The watermark message data can be used in conjunction with other data or applications to control processing of the multimedia or single media content. Using any of the scenarios above, for example, a decoder can extract a message that is used to control further media processing.

One example is where the watermark message is used as a necessary key for decoding or decrypting the media content. For example, the watermark message may contain necessary bits for decompressing (e.g., MPEG decoding) of the media signal or signals within the content (audio, video or both). Examples of necessary bits are CRC bits that are required to reconstruct coded video or audio data. This technique is particularly useful when the message is derived from watermark messages embedded in different media signals. In a movie copy control application, for instance, the decoder would have to generate a valid message based on decoding the raw message information from audio and video watermark messages before allowing playback, recording, etc. In this case, the embedder would spread the necessary control information into watermark messages inserted in the audio and video tracks. For example, watermark messages in audio or video frames include decompression parameters or descrambling keys to decompress or descramble subsequent audio or video frames.

The same approach can be implemented by embedding other forms of control data in one or more watermark messages in different media signals. Another example is a decryption key that is necessary to decrypt other media signals within the content, or other portions of the same media signal. Watermark messages in audio or video frames may include decryption keys to decrypt subsequent frames. One watermark message may include a key, or a portion of a key, needed to decrypt or unscramble other signal portions or other watermark messages. In the case where the watermark message includes only a portion of a key (e.g., one parameter in a key comprising two or more parameters), the other portion may be constructed by extracting another component of the key from another watermark message (in the same or different media signals) or from other metadata (e.g., in the disk wobble, the header file of MPEG content, etc.).

Another form of control data is region data that indicates that a particular media signal may only be played when the region data of the media signal and the player match. A similar region data scheme is understood to be implemented in the Content Scrambling System currently used for DVDs. The region data can be embedded in one or more watermarks in the same or different media signals. By placing this information in different media signals, the decoder must be able to extract consistent region data from watermarks in each of the media signals as a pre-requisite to further use of the content. Then, assuming all of the region data creates a valid region data message, then the copy control application would control playback based on whether the region data decoded from the watermarks (and/or metadata of the different media signals) matches the region data of the player.

3.0 Implementation of Watermark Encoders and Decoders

The state of watermark encoders and decoders for audio, video and still images is quite advanced. Some examples of watermark systems for multimedia data include U.S. Pat. Nos. 5,862,260, 5,930,369, and U.S. patent application Ser. No. 09/503,881. Examples of watermark systems targeted to audio signals include U.S. Pat. Nos. 5,945,932, 5,940,135, 6,005,501, and 5,828,325. Other watermark systems are described in U.S. Pat. Nos. 5,940,429, 5,613,004, 5,889,868, WO 99/45707, WO 99/45706, WO 99/45705, and WO 98/54897.

Examples of watermark systems used in copy control are: WO 00/04688, WO 00/04712, WO 00/04727, and WO 99/65240. These documents include examples where a copy protection scheme uses watermark data and metadata to control processing of a media signal.

Watermark systems that operate on compressed content include: U.S. Pat. No. 5,687,191; and WO 00/04722.

These watermark systems may be used to implement the scenarios described above.

3.1 Location of the Watermark Decoder

The watermark decoder may be implemented in one or more components. The location of these components varies depending on the application. For multimedia content on portable memory devices like DVDs or CDs, the decoder may be implemented in the drive hardware or in an interface to the drive hardware. Alternatively, the decoder may be located in an application program or device. One example is a media codec, like an MPEG decoder. If the media signals are compressed, the detector may have to implement at least portions of the codec. For example, if the watermark is coded in frequency coefficients in MPEG video and audio, the decoder system may include an MPEG parser and dequantizer to identify the media signals (audio and video signals) and extract the coefficients from each of the media signals. Placing the watermark decoder in the media codec, such as the MPEG codec, saves resources because many of the resources used for decoding the media signals may also be used for detecting and reading the watermarks.

3.2 Operating Environment

FIG. 5 illustrates an example of a computer system that may serve as an operating environment for software implementations of the watermarking systems described above. The encoder and decoder implementations as well as related media codecs and applications may be implemented in C/C++ and are portable to many different computer systems. Components may also be implemented in hardware devices or in a combination of hardware and software components. These components may be installed in a computing device such as a Personal Digital Assistant, Personal Computer, Hand-held media player, media players (DVD players, CD players, etc.) or implemented in a hardware module such as an integrated circuit module, ASIC, etc. FIG. 5 generally depicts one example of an operating environment for encoder and decoder systems.

The computer system shown in FIG. 5 includes a computer 1220, including a processing unit 1221, a system memory 1222, and a system bus 1223 that interconnects various system components including the system memory to the processing unit 1221.

The system bus may comprise any of several types of bus structures including a memory bus or memory controller, a peripheral bus, and a local bus using a bus architecture such as PCI, VESA, Microchannel (MCA), ISA and EISA, to name a few.

The system memory includes read only memory (ROM) 1224 and random access memory (RAM) 1225. A basic input/output system 1226 (BIOS), containing the basic routines that help to transfer information between elements within the computer 1220, such as during start-up, is stored in ROM 1224.

The computer 1220 further includes a hard disk drive 1227, a magnetic disk drive 1228, e.g., to read from or write to a removable disk 1229, and an optical disk drive 1230, e.g., for reading a CD-ROM or DVD disk 1231 or to read from or write to other optical media. The hard disk drive 1227, magnetic disk drive 1228, and optical disk drive 1230 are connected to the system bus 1223 by a hard disk drive interface 1232, a magnetic disk drive interface 1233, and an optical drive interface 1234, respectively. The drives and their associated computer-readable media provide nonvolatile storage of data, data structures, computer-executable instructions (program code such as dynamic link libraries, and executable files), etc. for the computer 1220.

Although the description of computer-readable media above refers to a hard disk, a removable magnetic disk and an optical disk, it can also include other types of media that are readable by a computer, such as magnetic cassettes, flash memory cards, digital video disks, and the like.

A number of program modules may be stored in the drives and RAM 1225, including an operating system 1235, one or more application programs 1236, other program modules 1237, and program data 1238.

A user may enter commands and information into the personal computer 1220 through a keyboard 1240 and pointing device, such as a mouse 1242. Other input devices may include a microphone, sound card, radio or television tuner, joystick, game pad, satellite dish, digital camera, scanner, or the like. A digital camera or scanner 43 may be used to capture the target image for the detection process described above. The camera and scanner are each connected to the computer via a standard interface 44. Currently, there are digital cameras designed to interface with a Universal Serial Bus (USB), Peripheral Component Interconnect (PCI), and parallel port interface. Two emerging standard peripheral interfaces for cameras include USB2 and 1394 (also known as firewire and iLink).

In addition to a camera or scanner, watermarked images or video may be provided from other sources, such as a packaged media devices (e.g., CD, DVD, flash memory, etc), streaming media from a network connection, television tuner, etc. Similarly, watermarked audio may be provided from packaged devices, streaming media, radio tuner, etc.

These and other input devices are often connected to the processing unit 1221 through a port interface 1246 that is coupled to the system bus, either directly or indirectly. Examples of such interfaces include a serial port, parallel port, game port or universal serial bus (USB).

A monitor 1247 or other type of display device is also connected to the system bus 1223 via an interface, such as a video adapter 1248. In addition to the monitor, personal computers typically include other peripheral output devices (not shown), such as speakers and printers.

The computer 1220 operates in a networked environment using logical connections to one or more remote computers, such as a remote computer 1249. The remote computer 1249 may be a server, a router, a peer device or other common network node, and typically includes many or all of the elements described relative to the computer 1220, although only a memory storage device 1250 has been illustrated in FIG. 5. The logical connections depicted in FIG. 5 include a local area network (LAN) 1251 and a wide area network (WAN) 1252. Such networking environments are commonplace in offices, enterprise-wide computer networks, intranets and the Internet.

When used in a LAN networking environment, the computer 1220 is connected to the local network 1251 through a network interface or adapter 1253. When used in a WAN networking environment, the personal computer 1220 typically includes a modem 1254 or other means for establishing communications over the wide area network 1252, such as the Internet. The modem 1254, which may be internal or external, is connected to the system bus 1223 via the serial port interface 1246.

In a networked environment, program modules depicted relative to the personal computer 1220, or portions of them, may be stored in the remote memory storage device. The processes detailed above can be implemented in a distributed fashion, and as parallel processes. It will be appreciated that the network connections shown are exemplary and that other means of establishing a communications link between the computers may be used.

4.0 Relationship with other Applications of Metadata

Watermarks can facilitate and cooperate with other applications that employ metadata of multimedia objects. As demonstrated above, this is particularly true in copy protection/control applications where the copy control information in the watermark and the metadata are used to control playback. The watermark message and metadata (in the MPEG file header or encoded in the disk wobble) can form components in a unified key that is a necessary prerequisite to playback or some other use of the content.

The watermarks in the media signals can each act as persistent links to metadata stored elsewhere, such as a metadata database server on the Internet or some other wire or wireless network. Applications for viewing and playing content can display metadata by extracting the link and querying a metadata database server to return the metadata (e.g., owner name, content description, sound or video annotation, etc.). The watermark decoder or an application program in communication with it can issue the query over the Internet using standard communication protocols like TCP/IP, database standards like ODBC, and metadata standards like XML. The query may be sent to a metadata router that maps the link to a metadata database server, which in turn, returns the metadata to the viewing application for display or playback to the user.

5.0 Concluding Remarks

The watermarking technology detailed herein can be employed in numerous diverse applications. See, e.g., the applications for watermarking detailed in commonly-owned U.S. Pat. No. 5,862,260, and copending application Ser. Nos. 09/292,569, 60/134,782, 09/343,104, 09/473,396, 09/476,686, and 60/141,763.

Having described and illustrated the principles of the invention with reference to several specific embodiments, it will be recognized that the principles thereof can be implemented in other, different, forms.

To provide a comprehensive disclosure without unduly lengthening the specification, applicant incorporates by reference any patents and patent applications referenced above.

The particular combinations of elements and features in the above-detailed embodiments are exemplary only; the interchanging and substitution of these teachings with other teachings in this and the incorporated-by-reference patents/applications are also contemplated.

In view of the wide variety of embodiments to which the principles of the invention can be applied, it should be recognized that the detailed embodiment is illustrative only and should not be taken as limiting the scope of the invention. Rather, we claim as our invention all such embodiments as may come within the scope and spirit of the following claims, and equivalents thereto.

Claims

1. A method for decoding auxiliary data in audio visual content with an audio and video track, comprising:

decoding digital watermarks in the audio and video tracks;
combining watermark messages from the audio and video tracks; and
using the combined messages to control processing of the audio visual content.

2. The method of claim 1 wherein the combined messages are used to control playback, copying or recording of the audio visual content.

3. A tangible medium on which is stored instructions for performing the method of claim 1.

4. A method for digital watermark decoding for audio visual content including an audio and video track, the method comprising:

decoding a first watermark from a first track of the audio visual content, the first track being the audio or video track;
and decoding a second media signal from a second track using the digital watermark from the first track, the second track being the audio or video track not including the first watermark.

5. The method of claim 4 wherein decoding the second media signal comprises decompressing the second media signal using the first watermark.

6. The method of claim 4 wherein the decoding comprises de-scrambling or decrypting the second media signal using the first watermark.

7. The method of claim 4 wherein the decoding comprises using information from the first watermark as a watermark key for decoding a different watermark from the second media signal.

8. The method of claim 7 wherein the watermark key specifies a location of the different watermark in the second media signal.

9. A tangible medium on which is stored instructions for performing the method of claim 4.

10. A method of digital watermark decoding from audio visual content having an audio and video track, the method comprising:

decoding at least a first watermark from a first media signal in the audio visual content;
decoding at least a second watermark from a second media signal in the audio visual content; and
forming a key for decoding data from at least the first and second watermarks.

11. The method of claim 10 wherein the first and second media signals are of the same media type.

12. The method of claim 10 wherein the first and second media signals are of different media types.

13. The method of claim 10 wherein the key comprises a watermark key used to decode a watermark from a media signal.

14. The method of claim 10 wherein the key comprises a decryption key used to decrypt a media signal.

15. The method of claim 10 wherein the key comprises a parameter used to decompress a media signal.

16. A tangible medium on which is stored instructions for performing the method of claim 10.

Referenced Cited

U.S. Patent Documents

2630525 March 1953 Tomberlin et al.
3493674 February 1970 Houghton
3562420 February 1971 Thompson
3569619 March 1971 Simjian
3585290 June 1971 Sanford
3665162 May 1972 Yamamoto et al.
3703628 November 1972 Philipson, Jr.
3805238 April 1974 Rothfjell
3809806 May 1974 Walker et al.
3838444 September 1974 Louglin et al.
3845391 October 1974 Crosby
3914877 October 1975 Hines
3922074 November 1975 Ikegami et al.
3971917 July 27, 1976 Maddox et al.
3982064 September 21, 1976 Barnaby
3984624 October 5, 1976 Waggener
4025851 May 24, 1977 Haselwood et al.
4225967 September 30, 1980 Miwa et al.
4230990 October 28, 1980 Lert, Jr. et al.
4231113 October 28, 1980 Blasbalg
4237484 December 2, 1980 Brown et al.
4238849 December 9, 1980 Gassmann
4252995 February 24, 1981 Schmidt et al.
4262329 April 14, 1981 Bright et al.
4313197 January 26, 1982 Maxemchuk
4333113 June 1, 1982 Kalinowski
4367488 January 4, 1983 Leventer et al.
4379947 April 12, 1983 Warner
4380027 April 12, 1983 Leventer et al.
4389671 June 21, 1983 Posner et al.
4395600 July 26, 1983 Lundy et al.
4423415 December 27, 1983 Goldman
4425642 January 10, 1984 Moses et al.
4425661 January 10, 1984 Moses et al.
4476468 October 9, 1984 Goldman
4495620 January 22, 1985 Steele et al.
4528588 July 9, 1985 Lofberg
4532508 July 30, 1985 Ruell
4547804 October 15, 1985 Greenberg
4553261 November 12, 1985 Froessl
4590366 May 20, 1986 Rothfjell
4595950 June 17, 1986 Lofberg
4637051 January 13, 1987 Clark
4639779 January 27, 1987 Greenberg
4644582 February 17, 1987 Morishita et al.
4647974 March 3, 1987 Butler et al.
4654867 March 31, 1987 Labedz et al.
4660221 April 21, 1987 Dlugos
4663518 May 5, 1987 Borror et al.
4665431 May 12, 1987 Cooper
4672605 June 9, 1987 Hustig et al.
4675746 June 23, 1987 Tetrick et al.
4677435 June 30, 1987 D'Aggraives et al.
4677466 June 30, 1987 Lert, Jr. et al.
4682794 July 28, 1987 Margolin
4697209 September 29, 1987 Kiewit et al.
4703476 October 27, 1987 Howard
4712103 December 8, 1987 Gotanda
4718106 January 5, 1988 Weinblatt
4739377 April 19, 1988 Allen
4750173 June 7, 1988 Bluthgen
4765656 August 23, 1988 Becker et al.
4775901 October 4, 1988 Nakano
4776013 October 4, 1988 Kafri et al.
4805020 February 14, 1989 Greenberg
4807031 February 21, 1989 Broughton et al.
4811357 March 7, 1989 Betts et al.
4811408 March 7, 1989 Goldman
4820912 April 11, 1989 Samyn
4835517 May 30, 1989 van der Gracht et al.
4855827 August 8, 1989 Best
4864618 September 5, 1989 Wright et al.
4866771 September 12, 1989 Bain
4874936 October 17, 1989 Chandler et al.
4876617 October 24, 1989 Best et al.
4879747 November 7, 1989 Leighton et al.
4884139 November 28, 1989 Pommier
4885632 December 5, 1989 Mabey et al.
4903301 February 20, 1990 Kondo et al.
4908836 March 13, 1990 Rushforth et al.
4908873 March 13, 1990 Philibert et al.
4920503 April 24, 1990 Cook
4921278 May 1, 1990 Shiang et al.
4939515 July 3, 1990 Adelson
4941150 July 10, 1990 Iwasaki
4943973 July 24, 1990 Werner
4943976 July 24, 1990 Ishigaki
4944036 July 24, 1990 Hyatt
4963998 October 16, 1990 Maufe
4965827 October 23, 1990 McDonald
4967273 October 30, 1990 Greenberg
4969041 November 6, 1990 O'Grady et al.
4972471 November 20, 1990 Gross et al.
4972476 November 20, 1990 Nathans
4977594 December 11, 1990 Shear
4979210 December 18, 1990 Nagata et al.
4993068 February 12, 1991 Piosenka
4996530 February 26, 1991 Hilton
5010405 April 23, 1991 Schreiber et al.
5027401 June 25, 1991 Soltesz
5036513 July 30, 1991 Greenblatt
5063446 November 5, 1991 Gibson
5073899 December 17, 1991 Collier et al.
5075773 December 24, 1991 Pullen et al.
5077608 December 31, 1991 Dubner
5077795 December 31, 1991 Rourke et al.
5079648 January 7, 1992 Maufe
5083224 January 21, 1992 Hoogendoorn et al.
5083310 January 21, 1992 Drory
5086469 February 4, 1992 Gupta et al.
5091966 February 25, 1992 Bloomberg et al.
5095196 March 10, 1992 Miyata
5103459 April 7, 1992 Gilhousen et al.
5113437 May 12, 1992 Best et al.
5128525 July 7, 1992 Stearns et al.
5134496 July 28, 1992 Schwab et al.
5144660 September 1, 1992 Rose
5146457 September 8, 1992 Veldhuis et al.
5148498 September 15, 1992 Resnikoff et al.
5150409 September 22, 1992 Elsner
5161210 November 3, 1992 Druyvesteyn et al.
5166676 November 24, 1992 Milheiser
5168147 December 1, 1992 Bloomberg
5181786 January 26, 1993 Hujink
5185736 February 9, 1993 Tyrrell et al.
5199081 March 30, 1993 Saito et al.
5200822 April 6, 1993 Bronfin et al.
5212551 May 18, 1993 Conanan
5213337 May 25, 1993 Sherman
5228056 July 13, 1993 Schilling
5243423 September 7, 1993 DeJean et al.
5245165 September 14, 1993 Zhang
5245329 September 14, 1993 Gokcebay
5247364 September 21, 1993 Banker et al.
5253078 October 12, 1993 Balkanski et al.
5257119 October 26, 1993 Funada et al.
5258998 November 2, 1993 Koide
5259025 November 2, 1993 Monroe et al.
5267334 November 30, 1993 Normille et al.
5278400 January 11, 1994 Appel
5280537 January 18, 1994 Sugiyama et al.
5293399 March 8, 1994 Hefti
5295203 March 15, 1994 Krause et al.
5299019 March 29, 1994 Pack et al.
5305400 April 19, 1994 Butera
5315098 May 24, 1994 Tow
5315448 May 24, 1994 Ryan
5319453 June 7, 1994 Copriviza et al.
5319724 June 7, 1994 Blonstein et al.
5319735 June 7, 1994 Preuss et al.
5325167 June 28, 1994 Melen
5327237 July 5, 1994 Gerdes et al.
5337361 August 9, 1994 Wang et al.
5337362 August 9, 1994 Gormish et al.
5349655 September 20, 1994 Mann
5351302 September 27, 1994 Leighton et al.
5374976 December 20, 1994 Spannenburg
5379345 January 3, 1995 Greenberg
5387941 February 7, 1995 Montgomery et al.
5396559 March 7, 1995 McGrew
5398283 March 14, 1995 Virga
5404160 April 4, 1995 Schober et al.
5404377 April 4, 1995 Moses
5408542 April 18, 1995 Callahan
5410598 April 25, 1995 Shear
5418853 May 23, 1995 Kanota et al.
5422963 June 6, 1995 Chen et al.
5422995 June 6, 1995 Aoki et al.
5425100 June 13, 1995 Thomas et al.
5428606 June 27, 1995 Moskowitz
5428607 June 27, 1995 Hiller et al.
5432542 July 11, 1995 Thibadeau et al.
5432870 July 11, 1995 Schwartz
5436653 July 25, 1995 Ellis et al.
5444779 August 22, 1995 Daniele
5446273 August 29, 1995 Leslie
5449895 September 12, 1995 Hecht et al.
5450122 September 12, 1995 Keene
5450490 September 12, 1995 Jensen et al.
5453968 September 26, 1995 Veldhuis et al.
5461426 October 24, 1995 Limberg et al.
5469506 November 21, 1995 Berson et al.
5473631 December 5, 1995 Moses
5479168 December 26, 1995 Johnson et al.
5481294 January 2, 1996 Thomas et al.
5488664 January 30, 1996 Shamir
5493677 February 20, 1996 Balogh et al.
5499294 March 12, 1996 Friedman
5500856 March 19, 1996 Nagase et al.
5510900 April 23, 1996 Shirochi et al.
5513011 April 30, 1996 Matsumoto et al.
5513260 April 30, 1996 Ryan
5515081 May 7, 1996 Vasilik
5521372 May 28, 1996 Hecht et al.
5524933 June 11, 1996 Kunt et al.
5526427 June 11, 1996 Thomas et al.
5530751 June 25, 1996 Morris
5530759 June 25, 1996 Braudaway et al.
5530852 June 25, 1996 Meske, Jr. et al.
5532920 July 2, 1996 Hartrick et al.
5537216 July 16, 1996 Yamashita et al.
5537223 July 16, 1996 Curry
5539471 July 23, 1996 Myhrvold et al.
5541662 July 30, 1996 Adams et al.
5541741 July 30, 1996 Suzuki
5544255 August 6, 1996 Smithies et al.
5548646 August 20, 1996 Aziz et al.
5557333 September 17, 1996 Jungo et al.
5559559 September 24, 1996 Jungo et al.
5568179 October 22, 1996 Diehl et al.
5568268 October 22, 1996 Tsuji et al.
5568570 October 22, 1996 Rabbani
5572010 November 5, 1996 Petrie
5572247 November 5, 1996 Montgomery et al.
5574787 November 12, 1996 Ryan
5576532 November 19, 1996 Hecht
5579124 November 26, 1996 Aijala et al.
5581800 December 3, 1996 Fardeau et al.
5582103 December 10, 1996 Tanaka et al.
5587743 December 24, 1996 Montgomery et al.
5590197 December 31, 1996 Chen et al.
5602920 February 11, 1997 Bestler et al.
5606609 February 25, 1997 Houser et al.
5611575 March 18, 1997 Petrie
5612943 March 18, 1997 Moses et al.
5613004 March 18, 1997 Cooperman et al.
5613012 March 18, 1997 Hoffman et al.
5614940 March 25, 1997 Cobbley et al.
5617148 April 1, 1997 Montgomery
5627655 May 6, 1997 Okamoto et al.
5629770 May 13, 1997 Brassil
5629980 May 13, 1997 Stefik et al.
5636292 June 3, 1997 Rhoads
5638443 June 10, 1997 Stefik et al.
5638446 June 10, 1997 Rubin
5646997 July 8, 1997 Barton
5647017 July 8, 1997 Smithies et al.
5649054 July 15, 1997 Oomen et al.
5652626 July 29, 1997 Kawakami et al.
5659613 August 19, 1997 Copeland et al.
5659726 August 19, 1997 Sandford, II et al.
5659732 August 19, 1997 Kirsch
5661574 August 26, 1997 Kawana
5663766 September 2, 1997 Sizer, II
5664018 September 2, 1997 Leighton
5666487 September 9, 1997 Goodman et al.
5671277 September 23, 1997 Ikenoue et al.
5680223 October 21, 1997 Cooper et al.
5687191 November 11, 1997 Lee et al.
5687236 November 11, 1997 Moskowitz et al.
5689587 November 18, 1997 Bender et al.
5689623 November 18, 1997 Pinard
5709932 January 20, 1998 Glez et al.
5712920 January 27, 1998 Spille
5719937 February 17, 1998 Warren et al.
5719984 February 17, 1998 Yamagata et al.
5721788 February 24, 1998 Powell et al.
5727092 March 10, 1998 Sandford, II et al.
5737025 April 7, 1998 Dougherty et al.
5737026 April 7, 1998 Lu et al.
5739864 April 14, 1998 Copeland
5745569 April 28, 1998 Moskowitz et al.
5761686 June 2, 1998 Bloomberg
5764763 June 9, 1998 Jensen et al.
5764770 June 9, 1998 Schipper et al.
5765152 June 9, 1998 Erickson
5774452 June 30, 1998 Wolosewicz
5778102 July 7, 1998 Sandford, II et al.
5799081 August 25, 1998 Kim et al.
5799082 August 25, 1998 Murphy et al.
5819289 October 6, 1998 Sanford, II et al.
5822360 October 13, 1998 Lee et al.
5822432 October 13, 1998 Moskowitz et al.
5826227 October 20, 1998 Jayant
5828325 October 27, 1998 Wolosewicz et al.
5835639 November 10, 1998 Honsinger et al.
5850249 December 15, 1998 Massetti et al.
5857038 January 5, 1999 Owada et al.
5859920 January 12, 1999 Daly et al.
5862218 January 19, 1999 Steinberg
5862260 January 19, 1999 Rhoads
5878010 March 2, 1999 Okamoto et al.
5889868 March 30, 1999 Moskowitz et al.
5893067 April 6, 1999 Bender et al.
5905505 May 18, 1999 Lesk
5905819 May 18, 1999 Daly
5907443 May 25, 1999 Hirata
5929920 July 27, 1999 Sizer, II
5930369 July 27, 1999 Cox et al.
5937000 August 10, 1999 Lee et al.
5940135 August 17, 1999 Petrovic et al.
5940429 August 17, 1999 Lam et al.
5943422 August 24, 1999 Van Wie et al.
5945932 August 31, 1999 Smith et al.
5960151 September 28, 1999 Takahashi
5970140 October 19, 1999 Sandford, II et al.
5982977 November 9, 1999 Naruse et al.
5987127 November 16, 1999 Ikenoue et al.
5987459 November 16, 1999 Swanson et al.
5991500 November 23, 1999 Kanota et al.
6000621 December 14, 1999 Hecht et al.
6031914 February 29, 2000 Tewfik et al.
6035177 March 7, 2000 Moses et al.
6044156 March 28, 2000 Honsinger et al.
6061793 May 9, 2000 Tewfik et al.
6078664 June 20, 2000 Moskowitz et al.
6086706 July 11, 2000 Brassil et al.
6151076 November 21, 2000 Hoffman et al.
6181802 January 30, 2001 Todd
6209094 March 27, 2001 Levine et al.
6211919 April 3, 2001 Zink et al.
6219634 April 17, 2001 Levine
6233347 May 15, 2001 Chen et al.
6233684 May 15, 2001 Stefik et al.
6266299 July 24, 2001 Oshima et al.
6282654 August 28, 2001 Ikeda et al.
6353672 March 5, 2002 Rhoads
6442285 August 27, 2002 Rhoads et al.
6611607 August 26, 2003 Davis et al.
20010032312 October 18, 2001 Runje et al.

Foreign Patent Documents

2943436 May 1981 DE
3806411 September 1989 DE
3806414 September 1989 DE
058 482 August 1982 EP
366 381 May 1990 EP
372 601 June 1990 EP
493 091 December 1990 EP
411 232 February 1991 EP
418 964 March 1991 EP
441 702 August 1991 EP
0565947 October 1993 EP
551 016 February 1994 EP
581 317 February 1994 EP
605 208 July 1994 EP
629 972 December 1994 EP
642 060 March 1995 EP
649 074 April 1995 EP
650 146 April 1995 EP
651 554 May 1995 EP
705 025 April 1996 EP
0618723 May 2001 EP
2063018 May 1981 GB
2067871 July 1981 GB
2104701 March 1983 GB
2196167 April 1988 GB
2204984 November 1988 GB
4-248771 September 1992 JP
05/242217 September 1993 JP
8-30759 February 1996 JP
WO89/08915 September 1989 WO
WO92/19073 October 1992 WO
WO93/25038 December 1993 WO
WO95/10835 April 1995 WO
WO95/14289 May 1995 WO
WO95/02091 July 1995 WO
WO96/21290 July 1996 WO
WO96/26494 August 1996 WO
WO96/27259 September 1996 WO
WO9731440 August 1997 WO
WO 97/33392 September 1997 WO
WO9746012 December 1997 WO
WO 98/53565 November 1998 WO
WO 00/00969 January 2000 WO
WO 00/22745 April 2000 WO
WO 02/03385 January 2002 WO

Other references

  • Cox et al., “Secure Spread Spectrum Watermarking for Images, Audio and Video”, Proc. IEEE Soutcon 96, Jun. 1996, pp. 243-246.
  • Zhao, Jian, “A WWW Service to Embed and Prove Digital Copyright Watermarks”, Proc. of the European Conference on Multimedia, Services and Techniques, pp. 1-115, May 1996.
  • Szepanski, Wofram, “Compatibility Problems in add-on Data Transmission for TV-Channels”, 2nd Symp and Tech Exh. on Electromagnetic Compatibility, Jun. 28, 1977, pp. 263-268.
  • Proceedings. Technological Strategies for Protecting Intellectual Property in the Networked Multimedia Environment, vol. 1 Issue 1, Jan. 1994, pp. 1-265.
  • Cox et al., Secure Spread Spectrum Watermarking for Images, Audio and Video. Proc. IEEE Southcon 96, Jun. 1996, pp. 243-246.
  • Zhao, Jian, “A WWW Service to Embed and Prove Digital Copyright Watermarks”, Proc. of the European Conference on Multimedia, Sevices and Techniques, pp. 1-15, May 1996.
  • Bender, et al., “Applications for Data Hiding,” IBM Systems Journal, vol. 39, No. 384, 2000, pp. 547-568.
  • Dittmann et al., “Content-Based Digital Signature for Motion Pictures Authentication and Content-Fragile Watermarking,” 1999 IEEE, pp. 209-213.
  • Dittmann et al., “Media-Independent Watermarking Classification and the Need for Combining Digital Video and Audio Watermarking for Media Authentication,” 2000 IEEE, pp. 62-67.
  • Ten Kate W.R., et al., “A New Surround-Stereo-Surround Coding Technique”, Phillips Research Laboratories, The Netherlands, May, 1992.
  • Gerzon, et al., “A High-Rate Buried-Data Channel for Audio CD,” presented at the 94.sup.th convention of the Audio Engineering Society, Mar. 16-19, 1993.
  • “Access Control and Copyright Protection for Images, Conditional Access and Copyright Protection Based on the Use of Trusted Third Parties,” 1995, 43 pages.
  • “Access Control and Copyright Protection for Images, WorkPackage 8: Watermarking,” Jun. 30, 1995, 46 pages.
  • “Access Control and Copyright Protection for Images, WorkPackage 3: Evaluation of Existing Systems,” Apr. 19, 1995, 68 pages.
  • “Access Control and Copyright Protection for Images, WorkPackage 1: Access Control and Copyright Protection for Images Need Evaluation,” Jun. 1995, 21 pages.
  • “Copyright Proctection for Digital Images, Digital Fingerprinting from FBI,” Highwater FBI brochure, 1995, 4 pages.
  • “Cyphertech Systems: Introduces Digital Encoding Device to Prevent TV Piracy,” Hollywood Reporter, Oct. 20, 1993, p. 23.
  • “Foiling Card Forgers With Magnetic Noise,”, Wall Street Journal, Feb. 8, 1994.
  • Frequently Asked Questions About Digimarc Signature Technology, Aug. 1, 1995, http://www.digimarc.com, 9 pages.
  • “High Water FBI Limited Presentation Image Copyright Protection Software,” FBI Ltd brochure, Jul., 1995, 17 pages.
  • “Holographic signatures for digital images,” The Seybold Report on Desktop Publishing, Aug. 1995, one page.
  • “NAB—Cyphertech Starts Anti-Piracy Broadcast Tests,” Newsbytes, New03230023, Mar. 23, 1994.
  • “Steganography,” Intellectual Property and the National Information Infrastructure The Report of the Working Group on Intellectual Property Rights, Sep. 1995, pp. 212-213.
  • “The Copyright Can of Worms Opened Up By The New Electronic Media,” Computergram Internations, pCGN07170006, Jul. 17, 1995, 3 pages total.
  • “Watermarking & Digital Signature: Protect Your Work!” Published on Internet 1996, http://Itswww.epfl.ch/jordan/watermarking.html.
  • “Access Control and Copyright Protection of Images, Conditional Access and Copyright Protection Based on the Use of Trusted Third Parties, ” 1995, 43 pages.
  • Anderson, “Stretching the Limits of Steganography,” Information Hiding, First International Workshop Proc., May 30-Jun. 1, 1996, pp. 39-48.
  • Arachelian, “White Noise Storm,” Apr. 11, 1994, Internet reference, 13 pages.
  • Arazi, et al., “Intuition, Perception, and Secure Communications,” IEEE Transactionson Systems, Man, and Cybernetics, vol. 19, No. 5, Sep./Oct. 1989, pp. 1016-1020.
  • Arthur, “Digital Fingerprints Protect Artwork,” New Scientist, Nov. 12, 1994, p. 24.
  • Aura, “Invisible Communication,” Helskinki University of Technology, Digital Systems Laboratory, Nov. 5, 1995, 13 pages.
  • Aura, “Practical Invisibility in Digital Communication,” Information Hiding, First Int. Workshop Proc. May 30-Jun. 1, 1996, pp. 265-278.
  • Barlett, et al., “An Overview of HighWater FBI Technology,” Posted on Internet Mar. 22, 1996, 12 pages.
  • Bender et al., “Techniques for Data Hiding,” Draft Preprint, Private Correspondence, dated Oct. 30, 1995, 45 pages.
  • Bender et al., “Techniques for Data Hiding,” Masschusetts Institute of Technology, Media Laboratory, Draft Preprint, Apr. 13, 1995, 10 pages.
  • Bender, Techniques for Data Hiding, Proc. SPIE, vol. 2420, Feb. 9, 1995, pp. 164-173.
  • Boland et al., “Watermarking Digital Images for Copyright Protection,” Fifth International Conference on Image Processing and its Applications, Conference Date Jul. 4-6, 1995, Conf. Publ. No. 410, p. 326-330.
  • Boneh, “Collusion-Secure Fingerprinting for Digital Data,” Department of Computer Science, Princeton University, 1995, 31 pages.
  • Boney et al., “Digital Watermarks for Audio Signals,” Proceedings of Multimedia '96, 1996 IEEE, pp. 473-480.
  • Bors et al., “Embedding Parametric Digital Signatures in Images,” EUSIPCO-96, Trieste, Italy, accepted for publication, Sep. 1996 (Published on internet Apr. 9, 1996, (http://poseidon.csd.auth.gr/papers/confers:1-ind.html)), 4 pages.
  • Boucqueau et al., Equitable Conditional Access and Copyright Protection for Image Based on Trusted Third Parties, Teleservices & Multimedia Communications, 2nd Int. Cost 237 Workshop, Second International Cost 237 Workshop, Nov., 1995; published 1996, pp. 229-243.
  • Brandt et al., “Representations that Uniquely Characterize Images Modulo Translation, Rotation, and Scaling,” Pattern Recognition Letters, Aug. 1, 1996, pp. 1001-1015.
  • Brassil et al., Electronic Marking and Identification Techniques to Discourage Document Copying, Proceedings of INFOCOM '94 Conference on Computer, IEEE Commun. Soc Conference, Jun. 12-16, 1994, pp. 1278-1287.
  • Brassil et al., “Hiding Information in Document Images,” Nov., 1995, 7 pages.
  • Braudaway et al., “Protecting Publicly-Available Images with a Visible Image Watermark,” SPIE vol. 2659, Feb. 1, 1996, pp. 126-133.
  • Brown, “S-Tools for Windows, Version 1.00; What is Steganography,” Internet reference, Mar. 6, 1994, 6 pages.
  • Bruckstein, A.M.; Richardson, T.J., A holographic transform domain image watermarking method, Circuits, Systems, and Signal Processing vol. 17, No. 3 p. 361-89, 1998. This paper includes an appendix containing an internal memo of Bell Labs, which according to the authors of the paper, was dated Sep. 1994.
  • Bruyndonckx et al., Neural Network Post-Processing of Coded Images Using Perceptual Masking, 1994, 3 pages.
  • Bruyndonckx et al., “Spatial Method for Copyright Labeling of Digital Images,” 1994, 6 pages.
  • Burgett et al., “A Novel Method for Copyright Labeling Digitized Image Data,” requested by e-mail from author (unavailable/password protected on IGD WWW site); 12 pages.
  • Caronni, “Assuring Ownership Rights for Digital Images,” Published in the Proceedings of ‘Reliable IT Systems,’ VIS '95, HH. Bruggerman and W. Gerhardt-Hackl (Ed.), Viewing Publishing Company, Germany, 1995, Jun. 14, 1994, 10 pages. (Originally published as an ETH (Zurich) Technical Report, “Ermitteln Unauthorisierter Verteiler von Maschinenlesbaren Daten,” Aug. 1993.
  • Caruso, “Digital Commerce, 2 plans for watermarks, which can bind proof of authorship to electronic works.” New York Times, Aug. 7, 1995, one page.
  • Castro et al., “Registration of Translated and Rotated Images Using Finite Fourier Transforms,” IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. PAMI-9, No. 5, Sep. 1987, pp. 700-703.
  • Cha et al., “A Solution to the On-Line Image Downgrading Problem,” Proc. 11.sup.th Annual Computer Security Applications Conf., Dec. 11, 1995, pp. 108-112.
  • Cheong, “Internet Agent, Spiders, Wanderers, Brokers, and Bots,” New Publising, Indianapolis, IN, 1996, 413 pages.
  • Choudhury, et al., “Copyright Protection for Electronic Publishing over Computer Networks,” IEEE Network Magazine, Jun. 1994, 18 pages.
  • Chudy, “Handcuff Digital Thieves,” Byte Magazine, Apr., 1996, 4 pages.
  • Clarke, “Invisible Code Tags Electronic Images,” Electronic Engineering Times, Jun. 12, 1995, n. 852, p. 42.
  • Cox et al., “A Secure, Imperceptable Yet Perceptually Salient, Spread Spectrum Watermark for Multimedia,” IEEE, Southcon/96, Conference Record, pp. 192-197, 1996.
  • Cox et al., “Secure Spread Spectrum Watermarking for Multimedia,” NEC Research Institute Technical Report, Dec. 5, 1995, 33 pages.

Patent History

Patent number: 6975746
Type: Grant
Filed: Aug 25, 2003
Date of Patent: Dec 13, 2005
Patent Publication Number: 20040037449
Assignee: Digimarc Corporation (Beaverton, OR)
Inventors: Bruce L. Davis (Lake Oswego, OR), Tony F. Rodriguez (Portland, OR), Geoffrey B. Rhoads (West Linn, OR)
Primary Examiner: Jose L. Couso
Attorney: Digimarc Corporation
Application Number: 10/648,105

Classifications

Current U.S. Class: Applications (382/100)